EP0157158B1 - Master cylinder and proportioning valve therefore - Google Patents
Master cylinder and proportioning valve therefore Download PDFInfo
- Publication number
- EP0157158B1 EP0157158B1 EP85102021A EP85102021A EP0157158B1 EP 0157158 B1 EP0157158 B1 EP 0157158B1 EP 85102021 A EP85102021 A EP 85102021A EP 85102021 A EP85102021 A EP 85102021A EP 0157158 B1 EP0157158 B1 EP 0157158B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- poppet
- proportioning valve
- master cylinder
- valve member
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/28—Valves specially adapted therefor
- B60T11/34—Pressure reducing or limiting valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
Definitions
- the present invention relates to a master cylinder and proportioning valve therefore and, in particular, a proportioning valve which is rendered inoperable in response to the position of a piston for the master cylinder.
- a screw-in proportioning valve is disclosed in US-A-4,213,655.
- This proportioning valve is adapted to threadably couple with the master cylinder housing so that a valve member cooperates with a poppet to control fluid pressure communication through the proportioning valve.
- the proportioning valve is insensitive to piston movement in the master cylinder bore so that even if a failure occurs in a separate brake circuit, the proportioning valve is operable to reduce brake fluid pressure in its associated brake circuit.
- a warning circuit is utilized to bypass a proportioning valve.
- a master cylinder and proportioning valve assembly comprising a housing defining a bore movably receiving a pair of pistons in cooperation with the housing to form a pair of pressure chambers communicating with brake circuits via outlet ports, the proportioning valve assembly being operatively connected with the housing via one of the outlet ports so that fluid pressure from one of the pressure chambers is communicated directly to the proportioning valve assembly during braking, the proportioning valve assembly including a valve member movable relative to the housing and defining a valve member opening therethrough for communicating fluid pressure from said one pressure chamber to an associated brake circuit, and a poppet cooperating with the valve member to alter fluid communication through the valve member opening in response to the movement of the valve member, the poppet being mechanically engageable with one of said pair of pistons to move away from a rest position to a bypass position wherein fluid pressure communication through the valve member opening is substantially unrestricted regardless of the position of the valve member relative
- the poppet is pivotably mounted in the proportioning valve assembly.
- Figure 1 is a cross sectional view of a master cylinder and proportioning valve in a brake system
- Figure 2 is an enlarged view of the circumscribed portion in Figure 1.
- a brake system for a vehicle includes a brake pedal 10 coupled to a master cylinder 12 in order to communicate fluid pressure to brake circuits 14 and 16 during braking.
- the master cylinder 12 includes a housing 18 with a bore 20 receiving a primary piston 22 and a secondary piston 24.
- a pair of pressure chambers 23 and 25 are formed within bore 20.
- the bore 20 is in communication with a reservoir 26 in a rest position for pistons 22 and 24 and the bore communicates via outlet ports 28 and 30 with brake circuits 14 and 16, respectively.
- a pair of return springs 32 and 34 bias the pistons 22 and 24 to their rest positions while a top hat assembly 36 is disposed between the pistons to control the spacing therebetween in the rest position.
- the outlet port 28 threadably receives a proportioning valve 40 so that fluid pressure communicated to brake circuit 14 is communicated through the proportioning valve 40.
- the proportioning valve includes a body 42 with a threaded end 44 coupled to housing 18 at port 28, a plug 46 coupled to the body 42, a valve member 48 extending between the body and the plug, and a poppet 50 opposing the valve member.
- a first spring 52 biases the valve member to its rest position abutting the plug 46 while a second spring 54 biases the poppet to its rest position abutting the body 42.
- the valve member 48 is provided with an opening 56 and the poppet is apertured at 58 so that fluid pressure communicates from the bore 20 to the brake circuit 14.
- the body 42 defines a first surface 60 slidably engaging the valve member 48, a first shoulder 62 adjoining surface 60, a second surface 64 spaced from valve member 48 to define a space for O-ring seal 66, and a second shoulder 68 engageable with the poppet 50.
- the poppet 50 includes a central stem 70 with a first end 72 adjacent the opening 56 and a second end 74 extending inwardly from port 28 into the bore 20.
- a web 76 extends outwardly from the stem 70 to define the aperture (or apertures) 58 and connect with a cylindrical skirt 78.
- the skirt 78 defines a first end 80 extending outwardly past the second shoulder 68 to oppose inward movement of seal 66.
- the first end 80 is also engageable with the second surface 64 to center the stem 70 relative to the valve member opening 56.
- the skirt 78 defines a second end 82 extending inwardly from the web 76 to keep the spring 54 away from aperture 58 so that a channel 84 between the second end 82 and the stem provides unrestricted communication between the bore 20 and the aperture 58.
- the skirt is provided with an outwardly extending rim 86 having an inner surface 88 forming a stop for the second spring 54 and an outer surface 90 normally in abutment with the body second shoulder 68.
- the master cylinder piston 24 forms a groove 92 on the end adjacent piston 22.
- the groove 92 extends from a first side 94 adjacent piston seal 96 to a second side 98.
- the poppet stem 70 extends into the groove 92 adjacent the side 94.
- the brake pedal 10 is depressed to move piston 22 toward piston 24. Both pistons are moved in the bore to close the bore to the reservoir 26 and generate fluid pressure in the chambers formed by the pistons. As a result, fluid pressure is communicated from the bore to the brake circuits 14 and 16 to effectuate a brake application. So long as the fluid pressure in brake circuit 14 remains below a predetermined valve, the valve member of the proportioning valve 40 will remain sufficiently spaced from the poppet 50 so that fluid communication via aperture 58 and opening 56 is uninterrupted. Above the predetermined value, the valve member is pressure responsive in a well known manner to move towards the poppet 50 so that the poppet first end 72 cooperates with the bottom end of the valve member to close the opening 56. As a result, the fluid pressure downstream of the valve member is less than the fluid pressure developed in the bore 20.
- the pivoted poppet displaces the first end 72 away from the valve member to a bypass position so that when the valve mem ber moves toward the poppet in response to fluid pressure in circuit 14, the first end 72 will remain sufficiently spaced therefrom to permit unrestricted fluid communication between the bore 20 and the circuit 14.
- a shoulder 41 on the valve member 40 abuts a shoulder 43 on the body 42 to limit movement of the valve member in the direction of the poppet 50.
- the poppet first end 72 will be pivoted to a position spaced from the valve member even with the latter abutting the shoulder 43 so long as the piston 24 is fully stroked in response to a leak of failure in circuit 16. Once the leak is repaired, the piston 24 will generate fluid pressure in chamber 25 so that the travel for piston 24 will be limited by fluid pressure in chamber 24 and the piston will remain spaced from the poppet stem 70 to permit normal operation of the proportioning valve 40.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Hydraulic Control Valves For Brake Systems (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Description
- The present invention relates to a master cylinder and proportioning valve therefore and, in particular, a proportioning valve which is rendered inoperable in response to the position of a piston for the master cylinder.
- A screw-in proportioning valve is disclosed in US-A-4,213,655. This proportioning valve is adapted to threadably couple with the master cylinder housing so that a valve member cooperates with a poppet to control fluid pressure communication through the proportioning valve. The proportioning valve is insensitive to piston movement in the master cylinder bore so that even if a failure occurs in a separate brake circuit, the proportioning valve is operable to reduce brake fluid pressure in its associated brake circuit. In US-A-3,686,864, a warning circuit is utilized to bypass a proportioning valve.
- From EP-A-0 146 734, which forms part of the State of the Art according to Article 54(3) EPC, it is known a master cylinder and proportioning valve assembly comprising a housing defining a bore movably receiving a pair of pistons in cooperation with the housing to form a pair of pressure chambers communicating with brake circuits via outlet ports, the proportioning valve assembly being operatively connected with the housing via one of the outlet ports so that fluid pressure from one of the pressure chambers is communicated directly to the proportioning valve assembly during braking, the proportioning valve assembly including a valve member movable relative to the housing and defining a valve member opening therethrough for communicating fluid pressure from said one pressure chamber to an associated brake circuit, and a poppet cooperating with the valve member to alter fluid communication through the valve member opening in response to the movement of the valve member, the poppet being mechanically engageable with one of said pair of pistons to move away from a rest position to a bypass position wherein fluid pressure communication through the valve member opening is substantially unrestricted regardless of the position of the valve member relative to the housing.
- It is the object of the present invention that the poppet interferes with movement of the piston only when the piston has moved beyond a normal travel during braking. This object is achieved by the features of claim 1.
- This object is achieved by the features of claim 1.
- According to the present invention, the poppet is pivotably mounted in the proportioning valve assembly.
- In the drawings, Figure 1 is a cross sectional view of a master cylinder and proportioning valve in a brake system, and Figure 2 is an enlarged view of the circumscribed portion in Figure 1.
- A brake system for a vehicle includes a brake pedal 10 coupled to a
master cylinder 12 in order to communicate fluid pressure tobrake circuits master cylinder 12 includes ahousing 18 with abore 20 receiving aprimary piston 22 and asecondary piston 24. A pair ofpressure chambers 23 and 25 are formed withinbore 20. Thebore 20 is in communication with areservoir 26 in a rest position forpistons outlet ports brake circuits return springs 32 and 34 bias thepistons top hat assembly 36 is disposed between the pistons to control the spacing therebetween in the rest position. - The
outlet port 28 threadably receives aproportioning valve 40 so that fluid pressure communicated tobrake circuit 14 is communicated through theproportioning valve 40. The proportioning valve includes abody 42 with a threadedend 44 coupled tohousing 18 atport 28, aplug 46 coupled to thebody 42, avalve member 48 extending between the body and the plug, and apoppet 50 opposing the valve member. Afirst spring 52 biases the valve member to its rest position abutting theplug 46 while asecond spring 54 biases the poppet to its rest position abutting thebody 42. Thevalve member 48 is provided with anopening 56 and the poppet is apertured at 58 so that fluid pressure communicates from thebore 20 to thebrake circuit 14. Thebody 42 defines afirst surface 60 slidably engaging thevalve member 48, afirst shoulder 62 adjoiningsurface 60, asecond surface 64 spaced fromvalve member 48 to define a space for O-ring seal 66, and asecond shoulder 68 engageable with thepoppet 50. - The
poppet 50 includes acentral stem 70 with afirst end 72 adjacent the opening 56 and asecond end 74 extending inwardly fromport 28 into thebore 20. Aweb 76 extends outwardly from thestem 70 to define the aperture (or apertures) 58 and connect with acylindrical skirt 78. Theskirt 78 defines afirst end 80 extending outwardly past thesecond shoulder 68 to oppose inward movement ofseal 66. Thefirst end 80 is also engageable with thesecond surface 64 to center thestem 70 relative to the valve member opening 56. Theskirt 78 defines asecond end 82 extending inwardly from theweb 76 to keep thespring 54 away fromaperture 58 so that achannel 84 between thesecond end 82 and the stem provides unrestricted communication between thebore 20 and theaperture 58. The skirt is provided with an outwardly extendingrim 86 having aninner surface 88 forming a stop for thesecond spring 54 and anouter surface 90 normally in abutment with the bodysecond shoulder 68. - The
master cylinder piston 24 forms agroove 92 on the endadjacent piston 22. Thegroove 92 extends from afirst side 94adjacent piston seal 96 to asecond side 98. In the rest position for thepiston 24, thepoppet stem 70 extends into thegroove 92 adjacent theside 94. - During normal braking, the brake pedal 10 is depressed to move
piston 22 towardpiston 24. Both pistons are moved in the bore to close the bore to thereservoir 26 and generate fluid pressure in the chambers formed by the pistons. As a result, fluid pressure is communicated from the bore to thebrake circuits brake circuit 14 remains below a predetermined valve, the valve member of theproportioning valve 40 will remain sufficiently spaced from thepoppet 50 so that fluid communication viaaperture 58 andopening 56 is uninterrupted. Above the predetermined value, the valve member is pressure responsive in a well known manner to move towards thepoppet 50 so that the poppetfirst end 72 cooperates with the bottom end of the valve member to close theopening 56. As a result, the fluid pressure downstream of the valve member is less than the fluid pressure developed in thebore 20. - In a fully braked position, the fluid pressure in chamber 25 prevents further movement of
piston 24 while the fluid pressure inchamber 23 prevents further movement ofpiston 22. With fluid pressure retained in chamber 25, thepiston 24 is displaced to contractspring 34 such thatpoppet stem 70 remains in the groove, albeit spaced from the rest position, in spaced relation to theend 98. If thebrake circuit 16 develops a leak, the chamber 25 will not retain fluid pressure so that thepiston 24 will move to an end ofbore 20 to engage theside 98 with thepoppet stem 70 and pivot the latter about the left edge ofouter surface 90. The pivoted poppet displaces thefirst end 72 away from the valve member to a bypass position so that when the valve mem ber moves toward the poppet in response to fluid pressure incircuit 14, thefirst end 72 will remain sufficiently spaced therefrom to permit unrestricted fluid communication between thebore 20 and thecircuit 14. Ashoulder 41 on thevalve member 40 abuts ashoulder 43 on thebody 42 to limit movement of the valve member in the direction of thepoppet 50. The poppetfirst end 72 will be pivoted to a position spaced from the valve member even with the latter abutting theshoulder 43 so long as thepiston 24 is fully stroked in response to a leak of failure incircuit 16. Once the leak is repaired, thepiston 24 will generate fluid pressure in chamber 25 so that the travel forpiston 24 will be limited by fluid pressure inchamber 24 and the piston will remain spaced from thepoppet stem 70 to permit normal operation of theproportioning valve 40.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59617784A | 1984-04-02 | 1984-04-02 | |
US596177 | 1984-04-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0157158A2 EP0157158A2 (en) | 1985-10-09 |
EP0157158A3 EP0157158A3 (en) | 1986-12-30 |
EP0157158B1 true EP0157158B1 (en) | 1990-01-31 |
Family
ID=24386258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85102021A Expired - Lifetime EP0157158B1 (en) | 1984-04-02 | 1985-02-23 | Master cylinder and proportioning valve therefore |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0157158B1 (en) |
JP (1) | JPS60226347A (en) |
AU (1) | AU575915B2 (en) |
BR (1) | BR8501614A (en) |
CA (1) | CA1242479A (en) |
DE (1) | DE3575704D1 (en) |
ES (1) | ES8607134A1 (en) |
MX (1) | MX162110A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4774809A (en) * | 1985-02-09 | 1988-10-04 | Tokico Ltd. | Tandem type master cylinder with pressure proportioning valve deactivated by a slidable actuating member |
JPS61133463U (en) * | 1985-02-09 | 1986-08-20 | ||
JPH0343896Y2 (en) * | 1986-09-24 | 1991-09-13 | ||
JPH0296248U (en) * | 1988-09-22 | 1990-07-31 | ||
JP2782207B2 (en) * | 1988-10-24 | 1998-07-30 | 株式会社ナブコ | Machine parts and hydraulic pressure control valves containing the parts |
JPH067018Y2 (en) * | 1989-02-14 | 1994-02-23 | 株式会社ナブコ | Hydraulic control valve |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146734A1 (en) * | 1983-12-01 | 1985-07-03 | Allied Corporation | Master cylinder and proportioning valve assembly |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1252623A (en) * | 1968-02-17 | 1971-11-10 | ||
US3686864A (en) | 1971-03-02 | 1972-08-29 | Bendix Corp | Multiple feature master cylinder |
JPS583851B2 (en) * | 1978-06-29 | 1983-01-24 | 日産自動車株式会社 | Tandem master cylinder with hydraulic control valve |
US4213655A (en) * | 1978-10-16 | 1980-07-22 | General Motors Corporation | Master cylinder assembly and brake system incorporating same |
JPS5926507B2 (en) * | 1979-02-14 | 1984-06-28 | 日産自動車株式会社 | Tandem master cylinder with hydraulic control valve |
JPS58142172U (en) * | 1982-03-19 | 1983-09-24 | トキコ株式会社 | Brake hydraulic pressure control valve |
-
1985
- 1985-02-23 DE DE8585102021T patent/DE3575704D1/en not_active Expired - Lifetime
- 1985-02-23 EP EP85102021A patent/EP0157158B1/en not_active Expired - Lifetime
- 1985-03-01 AU AU39411/85A patent/AU575915B2/en not_active Ceased
- 1985-03-08 MX MX20455485A patent/MX162110A/en unknown
- 1985-03-22 CA CA000477232A patent/CA1242479A/en not_active Expired
- 1985-03-29 ES ES541765A patent/ES8607134A1/en not_active Expired
- 1985-04-02 BR BR8501614A patent/BR8501614A/en not_active IP Right Cessation
- 1985-04-02 JP JP60068596A patent/JPS60226347A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0146734A1 (en) * | 1983-12-01 | 1985-07-03 | Allied Corporation | Master cylinder and proportioning valve assembly |
Also Published As
Publication number | Publication date |
---|---|
DE3575704D1 (en) | 1990-03-08 |
AU3941185A (en) | 1985-10-10 |
BR8501614A (en) | 1985-12-03 |
JPH0551501B2 (en) | 1993-08-02 |
EP0157158A3 (en) | 1986-12-30 |
ES541765A0 (en) | 1986-05-16 |
AU575915B2 (en) | 1988-08-11 |
ES8607134A1 (en) | 1986-05-16 |
MX162110A (en) | 1991-03-27 |
CA1242479A (en) | 1988-09-27 |
EP0157158A2 (en) | 1985-10-09 |
JPS60226347A (en) | 1985-11-11 |
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